source: By Nathorial - Own work, CC BY-SA 4.0

the joint connecting the foot with the leg:

足首(の関節), くるぶし(→ body)

e.g. as modifier : an ankle injury.

the narrow part of the leg between the foot and the calf:

e.g. her slim ankles

e.g. I stood up to my ankles in snow

e.g. as modifier : ankle socks.

1. with object informal leave:

e.g. he ankled the series to do a movie.

no object US informal walk.

｟俗｠ 歩く(walk)

2. no object (usually as noun ankling) flex the ankles while cycling in order to increase pedaling efficiency.

Old English ancleow, of Germanic origin; superseded in Middle English by forms from Old Norse; related to Dutch enkel and German Enkel, from an Indo-European root shared by angle1.